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公开(公告)号：US2492650A
公开(公告)日：1949-12-27
申请号：US55328444
申请日：1944-09-08
Applicant: ALUMINUM CO OF AMERICA
Inventor： MCLEAN DANIEL C , MORROW JOHN E , FOX JACOB R
IPC: C01F7/54
CPC classification number: C01F7/54
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